If you are contemplating evacuating and don't really have a place to go, that's a good way to find a place to crash. If I lived closer to NO I would probably offer up the couch and the floor to a couple of people, just so they would have a destination.
There is a time to charge, for example: 2000, Tallahassee, FL. Election snafu AND biggest football game of the season: Florida State vs. Florida. Well, the reporters, et al were kicked out of their rooms. People had reservations after all. People all around the city opened up their homes to the stranded reporters...for a price. My roommate was up for it, but we didn't have the time to go and offer it up. :) See, that's not an emergency, but to charge someone who is running for their life $100/night is despicable.
Oh, and next time there is to be envelope stuffing, give me a call, I'm not afraid of paper cuts :)